Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > sci.physics > #528207 > unrolled thread

History matters for glass hardness

Back to article view | Back to sci.physics

Contents

  History matters for glass hardness Sam Wormley <swormley1@gmail.com> - 2015-10-26 10:06 -0500
    Re: History matters for glass hardness jimp@specsol.spam.sux.com - 2015-10-26 17:20 +0000

#528207 — History matters for glass hardness

History matters for glass hardness
> http://scitation.aip.org/content/aip/magazine/physicstoday/news/10.1063/PT.5.7212


> The effects of annealing are well known, but the role of pressure
> history is less studied. When the researchers compared glasses of the
> same density and chemical makeup, those that had been annealed were
> significantly harder—as measured by indentation tests—than the
> pressure-quenched ones. The simulations reveal that both methods
> result in the same interatomic distances between nearest neighbors,
> but in the annealed glass the bond angles have a narrower
> distribution, which leads to greater short-range order. On the other
> hand, pressure quenching has a stronger influence on the medium-range
> order—the repetition distances for typical atomic arrangements—which
> has much less influence on the material’s hardness. Thus, as shown
> schematically here, thermal annealing and pressure-quenching
> treatments can be thought of as independent degrees of freedom,
> comparable to composition, in designing new industrial glasses. (M.
> M. Smedskjaer et al., J. Chem. Phys., in press.)



-- 

sci.physics is an unmoderated newsgroup dedicated
to the discussion of physics, news from the physics
community, and physics-related social issues.

[toc] | [next] | [standalone]

#528248

Sam Wormley <swormley1@gmail.com> wrote:
> History matters for glass hardness

Yet another puerile title for a puff piece about manufacturing engineering
of glass, spamming shit head.

Have you ever wondered what your life might have been like if you had
the competence to do more than just copy the words of others, spamming
piece of shit?


-- 
Jim Pennino

[toc] | [prev] | [standalone]

Back to top | Article view | sci.physics

csiph-web